There are 4 Action Zones:
Green : Buy
Red : Sell
Blue : Prebuy - use with other indicators (eg. Divergence) to comfirm.
Yellow : Presell - use with other indicators (eg. Divergence) to comfirm.
Buy signalafter presell can be used for pyramiding in an vice-versa.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.